JavaScript - Load multiple 3rd party widgets asyncronously.

LoadMultipleScriptsAsync.js

  var script,
    scripts = document.getElementsByTagName('script')[0],
    scriptList = {
      'plusone'  : '//apis.google.com/js/plusone.js',
      'twitter'  : '//platform.twitter.com/widgets.js',
      'someother': '//s.widgetsite.com/widget.js'
    };

for (var id in scriptList) {
  script = document.createElement('script');
  script.async = true;
  script.src = scriptList[id];
  scripts.parentNode.insertBefore(script, scripts);
}